/* ============================================================
   edu.chaya.dev — site chrome (landing + course pages)
   Fonts: Fraunces (display) · Source Serif 4 (body) · IBM Plex Mono (labels)
   ============================================================ */

:root{
  --paper:#f4f2ec;
  --surface:#fffefb;
  --surface-2:#ece9e0;
  --ink:#191817;
  --ink-2:#4b4842;
  --ink-3:#6f6a60;
  --rule:#ddd8cc;
  --rule-strong:#c4bdac;
  --gilt:#93701d;
  --gilt-soft:#f4ecd8;
  --shadow:0 1px 2px rgba(25,24,23,.05), 0 10px 30px -18px rgba(25,24,23,.35);
  --shadow-lift:0 2px 4px rgba(25,24,23,.06), 0 18px 44px -20px rgba(25,24,23,.42);

  --display:"Fraunces","Iowan Old Style",Georgia,serif;
  --body:"Source Serif 4","Iowan Old Style",Georgia,serif;
  --mono:"IBM Plex Mono",ui-monospace,"SF Mono",Menlo,Consolas,monospace;

  --measure:70ch;
  --wide:1160px;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --paper:#101216;
    --surface:#171a20;
    --surface-2:#1e222a;
    --ink:#e9e7e2;
    --ink-2:#b5b1a9;
    --ink-3:#8b867c;
    --rule:#2a2e36;
    --rule-strong:#3d424c;
    --gilt:#d9b45f;
    --gilt-soft:#2b2412;
    --shadow:0 1px 2px rgba(0,0,0,.4), 0 12px 32px -18px rgba(0,0,0,.7);
    --shadow-lift:0 2px 4px rgba(0,0,0,.5), 0 20px 48px -20px rgba(0,0,0,.8);
  }
}
:root[data-theme="dark"]{
  --paper:#101216;
  --surface:#171a20;
  --surface-2:#1e222a;
  --ink:#e9e7e2;
  --ink-2:#b5b1a9;
  --ink-3:#8b867c;
  --rule:#2a2e36;
  --rule-strong:#3d424c;
  --gilt:#d9b45f;
  --gilt-soft:#2b2412;
  --shadow:0 1px 2px rgba(0,0,0,.4), 0 12px 32px -18px rgba(0,0,0,.7);
  --shadow-lift:0 2px 4px rgba(0,0,0,.5), 0 20px 48px -20px rgba(0,0,0,.8);
}

/* course accent: each element carrying --ac-l/--ac-dk resolves --ac per theme */
[style*="--ac-l"]{--ac:var(--ac-l)}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]) [style*="--ac-l"]{--ac:var(--ac-dk)}
}
:root[data-theme="dark"] [style*="--ac-l"]{--ac:var(--ac-dk)}

*{box-sizing:border-box}
html{scroll-behavior:smooth; scroll-padding-top:5.5rem}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms !important; transition-duration:.01ms !important}
}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--body);
  font-size:17.5px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
a{color:inherit}
img{max-width:100%}
::selection{background:var(--gilt-soft); color:var(--ink)}

.skip{
  position:absolute; left:-9999px; top:0; z-index:100;
  background:var(--surface); color:var(--ink); padding:.6rem 1rem;
  border:1px solid var(--rule-strong); border-radius:4px; font-family:var(--mono); font-size:.8rem;
}
.skip:focus{left:1rem; top:1rem}

a:focus-visible, button:focus-visible, summary:focus-visible{
  outline:2px solid var(--gilt); outline-offset:2px; border-radius:2px;
}

/* ── top bar ─────────────────────────────────────────────── */
.topbar{
  position:sticky; top:0; z-index:50;
  display:flex; align-items:center; gap:1rem;
  padding:.65rem clamp(1rem,4vw,2.5rem);
  background:color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid var(--rule);
}
.wordmark{
  display:flex; align-items:baseline; gap:.5rem;
  text-decoration:none; white-space:nowrap;
}
.wordmark .wm-name{font-family:var(--display); font-weight:700; font-size:1.15rem; letter-spacing:.01em}
.wordmark .wm-dot{color:var(--gilt)}
.wordmark .wm-edu{
  font-family:var(--mono); font-size:.62rem; font-weight:600; letter-spacing:.16em;
  color:var(--gilt); border:1px solid var(--gilt); border-radius:3px;
  padding:.1rem .38rem .08rem; transform:translateY(-2px);
}
.crumbs{
  font-family:var(--mono); font-size:.72rem; letter-spacing:.04em; color:var(--ink-3);
  overflow:hidden; text-overflow:ellipsis; white-space:nowrap; min-width:0;
}
.crumbs a{color:var(--ink-3); text-decoration:none}
.crumbs a:hover{color:var(--ink)}
.crumbs .sep{margin:0 .45rem; color:var(--rule-strong)}
.topbar .spacer{flex:1}
.chip{
  font-family:var(--mono); font-size:.68rem; letter-spacing:.08em;
  color:var(--ink-2); border:1px solid var(--rule-strong); border-radius:999px;
  padding:.28rem .7rem; white-space:nowrap;
}
.tbtn{
  font-family:var(--mono); font-size:.72rem; letter-spacing:.05em;
  padding:.38rem .75rem; border:1px solid var(--rule-strong); border-radius:5px;
  background:var(--surface); color:var(--ink-2); cursor:pointer;
  transition:border-color .15s, color .15s;
}
.tbtn:hover{border-color:var(--gilt); color:var(--ink)}

/* ── landing hero ────────────────────────────────────────── */
.hero{
  position:relative;
  max-width:var(--wide); margin:0 auto;
  padding:clamp(3rem,8vw,5.5rem) clamp(1rem,4vw,2.5rem) clamp(2rem,5vw,3rem);
}
.hero::before{
  content:""; position:absolute; inset:0; z-index:-1;
  background-image:radial-gradient(var(--rule) 1px, transparent 1px);
  background-size:26px 26px;
  opacity:.5;
  -webkit-mask-image:radial-gradient(ellipse 90% 100% at 30% 0%, #000 0%, transparent 72%);
  mask-image:radial-gradient(ellipse 90% 100% at 30% 0%, #000 0%, transparent 72%);
}
.kicker{
  font-family:var(--mono); font-size:.72rem; font-weight:600;
  letter-spacing:.22em; text-transform:uppercase; color:var(--gilt);
  margin-bottom:1.1rem;
}
.hero h1{
  font-family:var(--display); font-weight:700;
  font-size:clamp(2.6rem,7vw,4.6rem); line-height:1.04; letter-spacing:-.02em;
  margin:0 0 1.2rem; max-width:14ch;
}
.hero h1 .amp{font-style:italic; font-weight:400; color:var(--gilt)}
.hero .lede{
  font-size:clamp(1.05rem,2vw,1.22rem); line-height:1.6; color:var(--ink-2);
  max-width:56ch; margin:0 0 1.4rem;
}
.hero .byline{
  display:flex; align-items:center; gap:.8rem; flex-wrap:wrap;
  font-family:var(--mono); font-size:.78rem; color:var(--ink-3);
}
.hero .byline a{color:var(--ink-2); text-decoration:none; border-bottom:1px solid var(--rule-strong)}
.hero .byline a:hover{color:var(--ink); border-color:var(--gilt)}
.orn{
  display:flex; align-items:center; gap:.9rem;
  max-width:var(--wide); margin:0 auto; padding:0 clamp(1rem,4vw,2.5rem);
  color:var(--rule-strong);
}
.orn::before,.orn::after{content:""; flex:1; height:1px; background:var(--rule)}
.orn .diamond{font-size:.7rem; color:var(--gilt); letter-spacing:.5em}

/* ── semester section ────────────────────────────────────── */
.semester{max-width:var(--wide); margin:0 auto; padding:clamp(1.8rem,4vw,3rem) clamp(1rem,4vw,2.5rem) 1rem}
.sem-head{display:flex; align-items:baseline; gap:1rem; flex-wrap:wrap; margin-bottom:1.6rem}
.sem-head h2{font-family:var(--display); font-size:clamp(1.6rem,3.4vw,2.2rem); font-weight:600; margin:0; letter-spacing:-.01em}
.sem-head .sem-meta{font-family:var(--mono); font-size:.74rem; letter-spacing:.05em; color:var(--ink-3)}
.sem-head .now-chip{
  font-family:var(--mono); font-size:.68rem; letter-spacing:.08em; font-weight:600;
  color:var(--gilt); background:var(--gilt-soft); border:1px solid color-mix(in srgb, var(--gilt) 40%, transparent);
  border-radius:999px; padding:.22rem .65rem;
}
.grid{
  display:grid; grid-template-columns:repeat(2, minmax(0,1fr));
  gap:clamp(1rem,2.4vw,1.6rem);
}
@media (max-width: 820px){ .grid{grid-template-columns:1fr} }

/* ── course card ─────────────────────────────────────────── */
.card{
  position:relative; display:flex; flex-direction:column;
  background:var(--surface);
  border:1px solid var(--rule); border-top:3px solid var(--ac);
  border-radius:10px;
  padding:1.5rem 1.6rem 1.3rem;
  text-decoration:none; color:var(--ink);
  box-shadow:var(--shadow);
  transition:transform .22s cubic-bezier(.2,.7,.3,1), box-shadow .22s, border-color .22s;
  overflow:hidden;
}
.card:hover{transform:translateY(-3px); box-shadow:var(--shadow-lift); border-color:color-mix(in srgb, var(--ac) 45%, var(--rule))}
.card .motif{
  position:absolute; right:-8px; bottom:-10px; width:150px; height:auto;
  color:var(--ac); opacity:.08; pointer-events:none;
  transition:opacity .25s;
}
.card:hover .motif{opacity:.15}
.card-top{display:flex; align-items:baseline; justify-content:space-between; gap:1rem; margin-bottom:.55rem}
.card-top .code{
  font-family:var(--mono); font-size:.82rem; font-weight:600; letter-spacing:.14em;
  color:var(--ac);
}
.card-top .cnum{font-family:var(--mono); font-size:.66rem; letter-spacing:.06em; color:var(--ink-3); white-space:nowrap}
.card h3{
  font-family:var(--display); font-weight:600;
  font-size:clamp(1.35rem,2.6vw,1.7rem); line-height:1.18; letter-spacing:-.012em;
  margin:0 0 .6rem;
}
.card .tagline{font-size:.95rem; line-height:1.55; color:var(--ink-2); margin:0 0 1.1rem; max-width:46ch}
.card-meta{
  display:flex; flex-wrap:wrap; gap:.4rem .5rem; margin-bottom:1rem;
}
.card-meta span{
  font-family:var(--mono); font-size:.64rem; font-weight:500; letter-spacing:.09em; text-transform:uppercase;
  color:var(--ink-2); background:var(--paper); border:1px solid var(--rule); border-radius:4px;
  padding:.24rem .5rem;
}
.card-foot{
  display:flex; align-items:center; justify-content:space-between; gap:1rem;
  margin-top:auto; padding-top:.9rem; border-top:1px solid var(--rule);
}
.card-foot .navail{font-family:var(--mono); font-size:.7rem; letter-spacing:.04em; color:var(--ink-3)}
.card-foot .go{
  font-family:var(--mono); font-size:.74rem; font-weight:600; letter-spacing:.05em;
  color:var(--ac); white-space:nowrap;
}
.card-foot .go::after{content:" →"; transition:transform .2s; display:inline-block}
.card:hover .go::after{transform:translateX(3px)}

/* reveal on load (only hidden when JS is running — html.js set by boot script) */
html.js .reveal{opacity:0; transform:translateY(14px)}
html.js .reveal.in{opacity:1; transform:none; transition:opacity .55s ease, transform .55s cubic-bezier(.2,.7,.3,1)}
@media (prefers-reduced-motion: reduce){ html.js .reveal{opacity:1; transform:none} }

/* ── landing "how it works" strip ────────────────────────── */
.how{max-width:var(--wide); margin:0 auto; padding:clamp(1.6rem,4vw,2.6rem) clamp(1rem,4vw,2.5rem)}
.how .strip{
  display:grid; grid-template-columns:repeat(3, minmax(0,1fr)); gap:1.4rem;
  background:var(--surface); border:1px solid var(--rule); border-radius:10px;
  padding:1.5rem 1.7rem; box-shadow:var(--shadow);
}
@media (max-width: 760px){ .how .strip{grid-template-columns:1fr} }
.how h4{
  font-family:var(--mono); font-size:.68rem; font-weight:600; letter-spacing:.16em; text-transform:uppercase;
  color:var(--gilt); margin:0 0 .45rem;
}
.how p{font-size:.92rem; line-height:1.6; color:var(--ink-2); margin:0}

/* ── footer ──────────────────────────────────────────────── */
footer.site{
  border-top:1px solid var(--rule); margin-top:clamp(2rem,5vw,4rem);
  background:var(--surface);
}
footer.site .cols{
  max-width:var(--wide); margin:0 auto;
  padding:2.2rem clamp(1rem,4vw,2.5rem) 1.4rem;
  display:grid; grid-template-columns:2fr 1fr 1fr; gap:2rem;
}
@media (max-width: 760px){ footer.site .cols{grid-template-columns:1fr} }
footer.site h5{
  font-family:var(--mono); font-size:.66rem; font-weight:600; letter-spacing:.16em; text-transform:uppercase;
  color:var(--ink-3); margin:0 0 .7rem;
}
footer.site p, footer.site li{font-size:.9rem; color:var(--ink-2); line-height:1.65}
footer.site p{margin:0 0 .5rem}
footer.site ul{list-style:none; margin:0; padding:0}
footer.site li{margin-bottom:.4rem}
footer.site a{color:var(--ink-2); text-decoration:none; border-bottom:1px solid var(--rule-strong)}
footer.site a:hover{color:var(--ink); border-color:var(--gilt)}
footer.site .fineprint{
  max-width:var(--wide); margin:0 auto;
  padding:1rem clamp(1rem,4vw,2.5rem) 2rem;
  border-top:1px solid var(--rule);
  font-family:var(--mono); font-size:.68rem; letter-spacing:.04em; color:var(--ink-3);
  display:flex; justify-content:space-between; gap:1rem; flex-wrap:wrap;
}

/* ============================================================
   course page
   ============================================================ */
.c-hero{
  max-width:var(--wide); margin:0 auto;
  padding:clamp(2.4rem,6vw,4rem) clamp(1rem,4vw,2.5rem) clamp(1.6rem,3vw,2.4rem);
  position:relative;
}
.c-hero::before{
  content:""; position:absolute; inset:0; z-index:-1;
  background-image:radial-gradient(var(--rule) 1px, transparent 1px);
  background-size:26px 26px; opacity:.45;
  -webkit-mask-image:radial-gradient(ellipse 80% 100% at 25% 0%, #000 0%, transparent 70%);
  mask-image:radial-gradient(ellipse 80% 100% at 25% 0%, #000 0%, transparent 70%);
}
.c-hero .kicker{color:var(--ac); margin-bottom:.9rem}
.c-hero .code-line{
  font-family:var(--mono); font-size:1rem; font-weight:600; letter-spacing:.18em;
  color:var(--ac); margin-bottom:.4rem;
}
.c-hero h1{
  font-family:var(--display); font-weight:700;
  font-size:clamp(2rem,5.4vw,3.4rem); line-height:1.08; letter-spacing:-.018em;
  margin:0 0 1.1rem; max-width:22ch;
}
.c-hero .desc{font-size:1.05rem; line-height:1.66; color:var(--ink-2); max-width:var(--measure); margin:0 0 1.5rem}
.chips{display:flex; flex-wrap:wrap; gap:.5rem; margin-bottom:1.5rem}
.chips .chip2{
  display:inline-flex; align-items:center; gap:.45rem;
  font-family:var(--mono); font-size:.7rem; font-weight:500; letter-spacing:.07em;
  color:var(--ink-2); background:var(--surface); border:1px solid var(--rule-strong); border-radius:999px;
  padding:.34rem .8rem;
}
.chips .chip2 b{color:var(--ink); font-weight:600}
.cta-row{display:flex; flex-wrap:wrap; gap:.7rem; align-items:center}
.btn{
  display:inline-flex; align-items:center; gap:.5rem;
  font-family:var(--mono); font-size:.78rem; font-weight:600; letter-spacing:.05em;
  padding:.62rem 1.1rem; border-radius:7px; text-decoration:none; cursor:pointer;
  border:1px solid var(--rule-strong); background:var(--surface); color:var(--ink-2);
  transition:border-color .15s, color .15s, transform .15s, box-shadow .15s;
}
.btn:hover{border-color:var(--ac); color:var(--ink); transform:translateY(-1px)}
.btn.primary{background:var(--ac); border-color:var(--ac); color:var(--paper)}
:root[data-theme="dark"] .btn.primary{color:#101216}
.btn.primary:hover{filter:brightness(1.08); color:var(--paper)}
:root[data-theme="dark"] .btn.primary:hover{color:#101216}
.dial{font-family:var(--mono); font-size:.72rem; color:var(--ink-3); margin-top:.8rem}
.dial a{color:var(--ink-3)}

/* section scaffolding */
.sect{max-width:var(--wide); margin:0 auto; padding:clamp(1.4rem,3.6vw,2.4rem) clamp(1rem,4vw,2.5rem)}
.sect > h2{
  font-family:var(--display); font-weight:600;
  font-size:clamp(1.5rem,3vw,2rem); letter-spacing:-.01em;
  margin:0 0 .4rem;
}
.sect > .sect-sub{font-size:.95rem; color:var(--ink-3); margin:0 0 1.5rem; max-width:var(--measure)}
.sect-label{
  font-family:var(--mono); font-size:.66rem; font-weight:600; letter-spacing:.2em; text-transform:uppercase;
  color:var(--ac); margin-bottom:.5rem;
}

/* notes grid */
.notes-grid{display:grid; grid-template-columns:repeat(auto-fill, minmax(290px,1fr)); gap:1rem}
.note-card{
  display:flex; gap:1rem; align-items:flex-start;
  background:var(--surface); border:1px solid var(--rule); border-radius:9px;
  padding:1.05rem 1.15rem; text-decoration:none; color:var(--ink);
  box-shadow:var(--shadow);
  transition:transform .2s cubic-bezier(.2,.7,.3,1), box-shadow .2s, border-color .2s;
}
.note-card:hover{transform:translateY(-2px); box-shadow:var(--shadow-lift); border-color:color-mix(in srgb, var(--ac) 45%, var(--rule))}
.note-card .nn{
  font-family:var(--mono); font-size:1.05rem; font-weight:600; color:var(--ac);
  background:color-mix(in srgb, var(--ac) 10%, var(--surface));
  border:1px solid color-mix(in srgb, var(--ac) 30%, transparent);
  border-radius:7px; padding:.35rem .55rem; line-height:1;
}
.note-card .nt{font-family:var(--display); font-weight:600; font-size:1.02rem; line-height:1.3; margin:0 0 .3rem}
.note-card .nw{font-family:var(--mono); font-size:.66rem; letter-spacing:.07em; color:var(--ink-3)}
.notes-empty{
  font-size:.95rem; color:var(--ink-3); background:var(--surface); border:1px dashed var(--rule-strong);
  border-radius:9px; padding:1.2rem 1.4rem;
}

/* schedule table */
.tbl-wrap{overflow-x:auto; background:var(--surface); border:1px solid var(--rule); border-radius:10px; box-shadow:var(--shadow)}
table.sched{border-collapse:collapse; width:100%; min-width:760px; font-size:.92rem}
table.sched th{
  font-family:var(--mono); font-size:.64rem; font-weight:600; letter-spacing:.12em; text-transform:uppercase;
  color:var(--ink-3); text-align:left; padding:.85rem 1rem .6rem;
  border-bottom:1px solid var(--rule-strong);
}
table.sched td{padding:.8rem 1rem; border-bottom:1px solid var(--rule); vertical-align:top; line-height:1.5}
table.sched tr:last-child td{border-bottom:0}
table.sched .wk{font-family:var(--mono); font-size:.72rem; font-weight:600; color:var(--ink-3); white-space:nowrap}
table.sched .ss{font-family:var(--mono); font-size:.74rem; color:var(--ink-2); white-space:nowrap}
table.sched .topic{min-width:26ch}
table.sched .holiday{display:block; font-family:var(--mono); font-size:.68rem; color:var(--gilt); margin-top:.35rem}
table.sched .due-chip{
  display:inline-block; font-family:var(--mono); font-size:.62rem; font-weight:600; letter-spacing:.06em;
  color:var(--gilt); background:var(--gilt-soft);
  border:1px solid color-mix(in srgb, var(--gilt) 40%, transparent);
  border-radius:4px; padding:.12rem .4rem; margin-top:.3rem;
}
table.sched td.notes-cell{white-space:nowrap}
table.sched .note-link{
  font-family:var(--mono); font-size:.74rem; font-weight:600; color:var(--ac); text-decoration:none;
  border-bottom:1px solid color-mix(in srgb, var(--ac) 40%, transparent);
}
table.sched .note-link:hover{border-bottom-color:var(--ac)}
table.sched .note-soon{font-family:var(--mono); font-size:.7rem; color:var(--ink-3)}
table.sched ul.todo{margin:0; padding-left:1.1rem; font-size:.84rem; color:var(--ink-2)}
table.sched ul.todo li{margin:0 0 .2rem}
table.sched tr.now td{background:color-mix(in srgb, var(--ac) 6%, transparent)}
table.sched tr.now .wk::after{
  content:"this week"; display:block; margin-top:.3rem;
  font-size:.6rem; font-weight:600; letter-spacing:.1em; text-transform:uppercase; color:var(--ac);
}
table.sched tr.finals td{background:color-mix(in srgb, var(--gilt) 6%, transparent)}

/* projects */
.proj-note{
  display:flex; gap:.7rem; align-items:baseline; flex-wrap:wrap;
  font-size:.95rem; color:var(--ink-2); margin-bottom:1.3rem;
}
.proj-grid{display:grid; grid-template-columns:repeat(2, minmax(0,1fr)); gap:1rem}
@media (max-width: 820px){ .proj-grid{grid-template-columns:1fr} }
.proj{
  background:var(--surface); border:1px solid var(--rule); border-radius:9px;
  padding:1.2rem 1.35rem; box-shadow:var(--shadow); position:relative;
}
.proj .p-top{display:flex; align-items:center; justify-content:space-between; gap:1rem; margin-bottom:.5rem}
.proj .p-n{font-family:var(--mono); font-size:.68rem; font-weight:600; letter-spacing:.14em; text-transform:uppercase; color:var(--ac)}
.proj .p-w{
  font-family:var(--mono); font-size:.78rem; font-weight:600; color:var(--ac);
  background:color-mix(in srgb, var(--ac) 10%, var(--surface));
  border:1px solid color-mix(in srgb, var(--ac) 30%, transparent);
  border-radius:5px; padding:.18rem .5rem;
}
.proj h3{font-family:var(--display); font-weight:600; font-size:1.15rem; margin:0 0 .5rem; line-height:1.25}
.proj p{font-size:.9rem; line-height:1.6; color:var(--ink-2); margin:0}

/* info section */
.info-grid{display:grid; grid-template-columns:repeat(2, minmax(0,1fr)); gap:1rem; align-items:start}
@media (max-width: 820px){ .info-grid{grid-template-columns:1fr} }
.panel{
  background:var(--surface); border:1px solid var(--rule); border-radius:9px;
  padding:1.2rem 1.35rem; box-shadow:var(--shadow);
}
.panel h3{
  font-family:var(--mono); font-size:.68rem; font-weight:600; letter-spacing:.16em; text-transform:uppercase;
  color:var(--ac); margin:0 0 .7rem;
}
.panel p{font-size:.92rem; line-height:1.6; color:var(--ink-2); margin:0 0 .6rem}
.panel p:last-child{margin-bottom:0}
.panel ul{margin:0; padding-left:1.15rem; font-size:.92rem; color:var(--ink-2)}
.panel li{margin-bottom:.42rem; line-height:1.55}
.panel li:last-child{margin-bottom:0}
.panel ol{margin:0; padding-left:1.25rem; font-size:.92rem; color:var(--ink-2)}
.panel ol li{margin-bottom:.42rem; line-height:1.55}

/* accordions */
details.acc{
  background:var(--surface); border:1px solid var(--rule); border-radius:9px;
  margin-bottom:.6rem; overflow:hidden;
}
details.acc summary{
  list-style:none; cursor:pointer;
  display:flex; align-items:center; gap:.7rem;
  font-family:var(--mono); font-size:.8rem; font-weight:600; letter-spacing:.03em;
  color:var(--ink-2); padding:.85rem 1.1rem;
}
details.acc summary::-webkit-details-marker{display:none}
details.acc summary::before{
  content:"›"; font-size:1.1rem; line-height:1; color:var(--ac);
  transition:transform .18s; display:inline-block;
}
details.acc[open] summary::before{transform:rotate(90deg)}
details.acc summary:hover{color:var(--ink); background:color-mix(in srgb, var(--ac) 4%, transparent)}
details.acc .acc-body{padding:.2rem 1.1rem 1rem 2.4rem; font-size:.9rem; line-height:1.62; color:var(--ink-2)}
details.acc .acc-body p{margin:0 0 .6rem}
details.acc .acc-body p:last-child{margin-bottom:0}

/* small tables (rubric, grading scale, time commitment) */
table.mini{border-collapse:collapse; width:100%; font-size:.86rem}
table.mini th{
  font-family:var(--mono); font-size:.62rem; font-weight:600; letter-spacing:.1em; text-transform:uppercase;
  color:var(--ink-3); text-align:left; padding:.45rem .6rem .35rem; border-bottom:1px solid var(--rule-strong);
}
table.mini td{padding:.5rem .6rem; border-bottom:1px solid var(--rule); vertical-align:top; color:var(--ink-2); line-height:1.5}
table.mini tr:last-child td{border-bottom:0}
table.mini .num{font-family:var(--mono); white-space:nowrap}
table.mini tr.total td{font-weight:600; color:var(--ink)}

/* course footer nav */
.c-backrow{
  max-width:var(--wide); margin:0 auto;
  padding:.6rem clamp(1rem,4vw,2.5rem) 0;
}
.c-backrow a{
  font-family:var(--mono); font-size:.74rem; color:var(--ink-3); text-decoration:none;
}
.c-backrow a:hover{color:var(--ink)}

/* 404 */
.err-wrap{min-height:70vh; display:flex; align-items:center; justify-content:center; text-align:center; padding:2rem}
.err-wrap .code404{font-family:var(--display); font-size:clamp(4rem,14vw,8rem); font-weight:700; color:var(--gilt); line-height:1; margin:0}
.err-wrap p{color:var(--ink-2)}